I suffered through many a month an' more trying to find these cursed knives, so this thread is to save you some of that. I understand that posting spoilers is prohibited on the message boards, and some of you want to find them yourselves, (why, I don't know) so this is to point you in the general direction. There are 19 of the little things so I will post 4 at a time in no particular order. sorryy
Hamamitsu Garden - Go for a swim in by the pond near the Town/Banquet Hall
Lake Of The Rising Sun - That little village you may not have known existed, check behind the broken sta---
Sujimura Village - Chase some yum all around the Mayor's crib.
Paths of Penance - Turtles are really important in Mooshu aren't they?